Given `l=28, S=144`, and there are total 9 terms. Find a

In an AP : Given l = 28 , S_(n) = 144 , and there are total 9 terms . Find a.

In an A.P: (i) Given a= 5, d=3, a_(n) = 50 , find n and S_(n) . (ii) Given a=7, a_(13) = 35 , find 'd' and S_(13) . (iii) Given a_(12) = 37 , d=3 , find a and S_(12) . (iv) Given a_(3) = 15, S_(10) = 125 , find 'd' and a_(10) . (v) Given d= 5, S_(9) = 75 , find 'a' and a_(9) . (vi) Given a=2, d=8, S_(n) = 90 , find 'n' and a_(n) . (vii) Given a=8, I=a_(n) = 62,S_(n) = 210 , find 'n' and 'd'. (viii) Given a_(n) = 4=I, d=2, S_(n) = -14 , find 'n' and 'a'. (ix) Given a=3, n=8, S_(n)= 192 , find 'd'. (x) Given I= 28, S_(n) = 144 , and there are a total 9 terms find 'a' .

Let there be an A.P. with first term ' a ' , common difference ' d ' . If a_n denotes its n t h term and S_n the sum of first n terms, find a , if a_n=28 ,\ \ S_n=144 and n=9 .

For a G. P. if S _(3) = 16, S _(6)= 144 find the first term and the common ratio of the G.P

In an A.P., the last term is 28 and the sum of all the 9 terms of the A.P. is 144. Find the first term.

The first term and common ratio of a G.P. are both positive. The product of first and second term is 9 and that of first and fourth term is 144. Find the third term.

In a GP, the sum of the first three terms is 18, and the sum of the next three terms is 144.Find the ratio(r) and first term(a).

Find the value of 9.756-6.28

Let there be an A.P.with first term a', common difference 'd'. If a_(n) denotes its nth term and S_(n) the sum of first n terms,find a, if a_(n)=28,quad S_(n)=144 and n=9